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L3092 Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L3092
Beschreibung SLIC KIT OPTIMIZED
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 32 Seiten
L3092 Datasheet, Funktion
www.DataSheet4U.com
L3000S
L3092
SLIC KIT OPTIMIZED FOR APPLICATIONS WITH BOTH
FIRST AND SECOND GENERATION COMBOS
PROGRAMMABLE DC FEED RESISTANCE
AND LIMITING CURRENT (25/40/60mA)
LOW ON-HOOK POWER DISSIPATION
(50mW typ)
SIGNALLING FUNCTION (off-hook/GND-Key)
QUICK OFF-HOOK DETECTION IN CVS FOR
LOW DISTORTION (< 1 %) DIAL PULSE DE-
TECTION
HYBRID FUNCTION
RINGING GENERATION WITH QUASI ZERO
OUTPUT IMPEDANCE, ZERO CROSSING IN-
JECTION (no ext. relay needed) AND RING
TRIP DETECTION
ABSOLUTELY NO NOISE INJECTED ON
ADIACENT LINES DURING RINGING SE-
QUENCE
AUTOMATIC RINGING STOP WHEN OFF-
HOOK IS DETECTED
TEST MODE ALLOWS LINE LENGHT MEAS-
UREMENT
PARALLEL LATCHED DIGITAL INTERFACE
LOW NUMBER OF EXTERNAL COMPO-
NENTS WITH STANDARD TOLERANCE
ONLY : 9 1% RESISTORS AND 5 10-20% CA-
PACITORS (for 600 ohm appl.)
POSSIBILITY TO WORK ALSO WITH HIGH
COMMON MODE CURRENTS
GOOD REJECTION OF THE NOISE ON BAT-
TERY VOLTAGE (20dB at 10Hz ; 35dB at
1KHz)
INTEGRATED THERMAL PROTECTION
SURFACE MOUNT PACKAGE (PLCC28 +
PowerSO-20)
-40°C TO 85°C: L3000S/L3092
DESCRIPTION
The SLIC KIT (L3000S/L3092) is a set of solid
state devices designed to integrate many of the
functions needed to interface a telephone line. It
consists of 2 integrated devices ; the L3000S line
interface circuit and the L3092 control unit.
The kit implements the main features of the
BORSHT functions:
- Battery feed (balance mode)
- Ringing Injection
- Signalling Detection
DIP28
ORDERING NUMBER:
L3092N
FLEXIWATT15
ORDERING NUMBER:
L3000SX-VC
PLCC28
ORDERING
NUMBER:
L3092FN
PowerSO20
(slug-up)
ORDERING
NUMBER:
L3000SX
PowerSO20
(slug-down)
ORDERING
NUMBER:
L3000SX-77
- Hybrid Function
The SLIC KIT injects the ringing signal in bal-
anced mode and requires a positive supply volt-
age of typically + 72V to be available on the sub-
scriber card.
The L3000S/L3092 kit generates the ringing sig-
nal internally, avoiding the requirement for expen-
sive external circuitry. A low level 1.5Vrms input is
required. (This can be provided by the combo).
A special operating mode limits the SLIC KIT
power dissipation to 50mW in on-hook condition
keeping the on/off hook detection circuit active.
Through the Digital Interface it is also possible to
set an operating mode that allows measurements
of loop resistance and therefore of line lenght.
This kit is fabricated using a 140V Bipolar tech-
nology for L3000S and a 12V Bipolar I2L technol-
ogy for L3092.
Both devices are available PTH application
(FLEXIWATT15 and DIP28) or SMD application
(PowerSO-20 and PLCC28).
This kit is specially suitable to Private Automatic
Branch Exchange (PABX) and Low Range C.O.
Applications.
December 1997
1/32
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.






L3092 Datasheet, Funktion
www.DataSheet4U.com
L3000S - L3092
FUNCTIONAL DIAGRAM
L3000S
FUNCTIONAL DESCRIPTION
L3000S - HIGH VOLTAGE CIRCUIT
The L3000S line interface provides battery feed
for telephone lines and ringing injection. Both
these operations are done in Balance Mode. This
is very important in order to avoid the generation
of common mode signals in particular during the
pulse dialling operation of the telephone set con-
nected to the SLIC. The IC contains a state de-
coder that under external control can force the fol-
lowing operational modes : stand-by,
conversation and ringing.
In addition Power down mode can be forced con-
necting the bias current resistor to VDD or leaving
it open.
Two pins, IL and IT, carry out the information con-
cerning line status which is detected by sensing
the line current into the output stage.
The L3000S amplifies both the AC and DC signals
entering at pin 6 (VIN) by a factor equal to 40.
Separate grounds are provided :
- Analog ground as reference for analog sig-
nals
- Battery ground as a reference for the output
stages
The two ground should be shorted together at a
low impedance point.
6/32
L3092 - LOW VOLTAGE CIRCUIT
The L3092 Low Voltage Control Unit controls the
L3000S line interface module providing set up
data to set line feed characteristics and to inject
ringing. An on chip digital parallel interface allows
a microprocessor or a second generation
COMBO as the TS5070 to control all the opera-
tions.
L3092 defines working states of Line Interface
Circuit and also informs the card controller about
line status.
L3000S WORKING STATES
In order to carry out the different possible opera-
tions, the L3000S has several different working
states. Each state is defined by the voltage re-
spectively applied by pin 12 and 13 of L3092 to
the pins 12 and 11 of L3000S.
Three different voltage levels (–3, 0, +3) are avail-
able at each connection, so defining nine possible
states as listed in tab. 1.
Appropriate combinations of two pins define four
of the five possible L3000S working states that
are:
a) Stand-by (SBY)
b) Conversation (CVS)

6 Page









L3092 pdf, datenblatt
www.DataSheet4U.com
L3000S - L3092
6) RINGING MODE
When the ringing function is selected by the con-
trol processor a low level signal (1.5Vrms) with a
frequency in the range from 16 to 70Hz, perma-
nently applied to the L3092 (pin RGIN), is ampli-
fied and injected in balanced mode into the line
through the L3000S with a super imposed DC
voltage of 24V typ.
This low level sinewave can be obtained also
from COMBO connecting RGIN pin to RX
COMBO output with a decoupling capacitor.
The first and the last ringing cycles are synchro-
nized by the L3092 so that the ringing signal al-
ways starts and stops when the line voltage
crosses zero.
When this mode is activated, the L3000S oper-
ates between the negative and the positive bat-
tery voltages typically - 48V and + 72V. The im-
pedance to the line is just equal to the two
external resistors (typ. 100).
Ring trip detection is performed autonomously by
the SLIC, without waiting for a command from the
control processor, using a patented system which
allows detection during a ringing burst ; when the
off-hook condition is detected, the SLIC stops the
ringing signal and forces the Conversation Mode.
In this condition, if CS = 0V, the output pin ONHK
goes to 0V.
After the detection of the ONHK = 0, the Card
Controller must set the SLIC in Conversation
Mode to remove the internal latching of the
On/Off hook information.
CONTROL INTERFACE BETWEEN THE SLIC
AND THE CARD CONTROLLER
The SLIC states and functions are controlled by
microprocessor or interface latches of a second
generation combo through seven wires that de-
fine a parallel digital interface.
The seven pins of the digital interface have the
following functions :
- Chip select input (CS)
- Power on/off input (PWON)
- Ring enable input (RNG)
- Automatic SBY input (AUT)
- Limiting current input (LIM)
- On hook/Off hook detection output (ONHK)
- Ground Key detection output (GDK)
The four input pins PWON, RNG, AUT and LIM,
set the status of the SLIC as shown in the follow-
ing table.
The output pin ONHK is equals to 0V when the
line is in OFF hook condition (lline > 7,5mA) and is
equal to + 5V when the line is in On hook condi-
tion (Iline < 5,5mA).
The output pin GDK monitors the ground key
function when the SLIC is in Conversation (CVS)
Mode and the DC operating region (limiting or re-
sistive) in Test (TS) Mode. When the SLIC is in
Conversation (CVS) Mode and IGDK (longitudinal
current) > 12mA, pin GDK is set to 0V ;
Operating Mode
Conversation 25mA
Conversation 40mA
Conversation 60mA
Stand-by
Automatic Stand-by
Power-down
Test Mode
Ringing (CVS 25mA)
Ringing (CVS 40mA)
Ringing (CVS 60mA)
RNG
0
0
0
0
1
1
0
1
1
1
Input Pin
PWON AUT
11
10
10
00
01
00
01
11
10
10
Output Pin
LIM ONHK
GDK
X 1 on-hook
1 0 off-hook
0
1 Ground key not detected.
0 Ground key detected.
X Disable
X
X C1 Comparator Output Disable
X 1 on-hook
X 0 off-hook
1
0
0 Limiting Region
1 Resistive Region
Disable
N.B. : When Ringing Mode is selected, you must choose also which of the three possible Conversation Modes. The SLIC will automatically
select if Off-Hook condition will be detected during ringing.
When IGDK < 8mA, pin GDK set to + 5V
The longitudinal current (IGDK) is defined as fol-
lows :
IGDK
=
Ib
2
Ia
Where Ia is the current sourced from pin TIP and
Ib is the current sunk into pin RING.
The CS input pin allows to connect the I/O pins of
the digital interfaces of many SLIC together.
12/32

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